Presenter: Hans-Peter Steinrück (Universität Erlangen-Nürnberg, Germany)
Topic: Ionic liquids: "Growth and layer exchange processes of ionic liquid on metal surfaces"
Time: November 17, 14:00 (Monday)
Location: 909-B
Abstract:
When talking about homogeneous catalyst systems, it has long been assumed that the system at hand consists of a transition metal complex in solution with the liquid interface representing the composition of the bulk solution. Now, in light of considerable developments in the study of metal complexes dissolved in ionic liquids with their negligible vapor pressures, more detailed studies of the composition at the liquid/gas interface became possible. These investigations revealed pronounced surface enrichment and segregation effects of high relevance for practical applications. This talk reviews recent advancements in tailoring the interfacial composition of ionic liquid-based catalytic systems. A particular focus is dedicated to surface enrichment phenomena, and a variety of parameters are presented for deliberate control of the local concentration of the complexes at the surface, that is, the nature of the ligands, the bulk concentration, the temperature, and the nature of the IL solvent. As experimental methods, angle-resolved X-ray photoelectron spectroscopy (ARXPS) and vacuum-based pendant-drop surface tension measurements were applied. The reviewed results are intended to provide the basis for the advancement of catalytic systems with high surface areas, such as in supported ionic liquid phase (SILP) catalysis, where the interface design is directly interconnected with catalytic performance.
Biography：
Hans-Peter Steinrück did his PhD in physics at TU Graz 1985, was postdoc at Stanford University 1985/86, received his Habilitation at TU München 1992, and became Professor of Physics at Würzburg University in 1993. From 1998 to 2025, he held a chair of Physical Chemistry at Friedrich-Alexander-University Erlangen-Nuremberg (FAU), and since 2025 is Senior Professor at (FAU). He was/is Guest Professor at USTC/Hefei and Soochow University/Suzhou in China, holds a honorary doctorate degree from Szeged University in Hungary, is member of the European Academy of Sciences, the German Academy of Sciences Leopoldina, the Austrian Academy of Sciences and Academia Europaea, and is Fellow of APS and AAAS. In 2016 he received an ERC Advanced Grant, in 2017 the AVS Medard W. Welch Award in the USA, in 2019 the Morino Lectureship in Japan, and in 2021 the Henriette-Herz-Scout distinction of the Alexander von Humboldt Foundation in Germany. His research focusses in surface and interface science, from ionic liquids, porphyrins, liquid metals and liquid organic hydrogen carriers to chemically modified graphene. He published more than 450 peer-reviewed papers.
责任编辑：郭伶俐